Malicious PDF — malware analysis report

Static analysis result for SHA-256 dae342a23894e87a…

MALICIOUS

PDF

88.0 KB Created: 2021-09-18 11:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 76e531835fd46d530d4e47fbbf8c9dd6 SHA-1: 1b4a8af3bd054b9ff26e8a57a04a6694d3b67003 SHA-256: dae342a23894e87a7dd2650ac8e4cdf141cc6f108e74adbb12960b1f0c969f50
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. The PDF also contains numerous external URIs, many of which point to disposable domains and are likely used for phishing or to host further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://hypotekaprezamestnancov.sk/res/file/jesamikup.pdf In PDF document text
    • http://dezis.ru/uploads/files/pexefiludabemozujabe.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/4ths5vrn3h754pmdtean71659j/xotezixin.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/32417449966.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/luwurewavizabajakugita.pdfIn PDF document text
    • https://triosms.com/userfiles/file/topupepatulutog.pdfIn PDF document text
    • http://dasbluemchen.com/mupix.pdfIn PDF document text
    • http://lynhuagiasi.com/Images_upload/files/47086397582.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb95ee3ff8---63863193872.pdfIn PDF document text
    • https://thokhoavietnam.com/upload/files/47113781371.pdfIn PDF document text
    • https://glamweddingdesign.com/userfiles/file/toxekufuxeridij.pdfIn PDF document text
    • http://happy-land.hu/editor_up/lomugusovopipovubob.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/83306357892.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/sogewavomujogiranobi.pdfIn PDF document text
    • http://raczcsalad.hu/files/36311315073.pdfIn PDF document text
    • https://inprovitecuador.com/ckfinder/userfiles/files/nefuganerepusawi.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/55709167107.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/roxewitubelowawebekom.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/kinubebo.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/silizusexukiwaz.pdfIn PDF document text
    • https://tp-pos.com/uploads/image/files/dudoni.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/70211713390.pdfIn PDF document text
    • http://yasaitogo.com/uploads/files/fopewipupuluxojoni.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/barivikibizod.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/mamejazin.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/gidusot.pdfIn PDF document text
    • https://e-midas.ro/files/file/favezufalixesovew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=godzilla+game+for+androidPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F9 17172 bytes
SHA-256: bfd4758975474dba976d9c254972ad9d3af28a07abeef5ca20e0bfbaf0f848f7
font_01_sfnt_off00012250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12250 10528 bytes
SHA-256: 8a9284d8965b17b2377f07368e2b20819ab138e3c5dddab6d56644a65ef37cc8
font_02_sfnt_off00013a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1